Abstract
We continue the study of boundary value problems on two–ndimensional polygona; topological networks, extensions of oblique derivative problems and of interface problems in a polygonal domain of the plane. The aim of this paper is firstly, to deal with non variational problems, secondly, to show that a weak solution may be dplit into a regular part and a singular part and thridly, to give the extract formula for the coeffcients of the singularities.
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